Method of making a valve construction having multiple piston means
AssigneeRobertshaw Controls Company
InventorMarvin P. Weaver
Life of this patent
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Abstract
A valve construction having a housing provided with a chamber and ports leading to the chamber and having an axially movable piston unit disposed in the chamber to interconnect certain of the ports together in relation to the axial position of the piston unit that is caused by a condition responsive device operatively associated with the piston unit, the piston unit comprising a plurality of pistons disposed in spaced parallel relation and being secured together to be axially moved in unison in the chamber under the influence of the condition responsive device.
Claims14
In a method of making a valve construction having a housing means provided with a chamber and port means leading to said chamber and having an axially movable piston means disposed in said chamber to interconnect certain of said port means together in relation to the axial position of said piston means that is caused by a condition responsive device and a spring means operatively associated with said piston means, the improvement comprising the steps of forming said piston means to comprise a plurality of pistons disposed in spaced parallel relation and being secured together to be axially moved in unison in said chamber under the influence of said condition responsive device, disposing a single coiled compression spring in said chamber, and telescoping said spring over all of said pistons so that all of said pistons are axially disposed inside said spring.
Dependencies are inferred from the claim text.